US848285A - Blank-support for tube-mills. - Google Patents

Description

No 848,285. PATENTED MAR. 26, 1907.

G; H. BLAXIER. BLANK SUPPORT FOR TUBE MILLS.

APPLICATION IILED SEPIZN. 1905.

UNITED snags PATENT- oFFioE.

sEoRcE HENRY BLAXTER, OF BEAVER, PENNSYLVANIA, ASSIGNOR To PlITSBURGH SEAMLESS TUBE COMPANY, OF BEAVER FALLS,-PENN- SYLVANIA, AooR oRAr o OF PENNSYLVANIA.

BLANK-SUPPORT FOR TUBE-MILLS.

- Specification of Letters Patent.

Patented Maren 26, 1907.

Application filed .ieptemher 19,1905. Serial No. 219,094

specification, lIl wlucl1 Figure 1 .is a view in side elevation of a piercing-mill provided with myimprovement.

Fig. 2 is a horizontal sectional view indicated by the line ll ll of l ig. 1, illustrating the commencement of the operation. l ig. 3 is an enlarged cross-sectional view on the line III Ill of big. 1. big. 1 is a similar view on the line IV 1V, SllO'WlDg the sliding support and slides only. big. 5 is a perspective detail view of the sliding support. Big. 6 is a detail view illustrating amodined construction. Big. 7is an end View of the bearing shown in Fig. 6.

My invention relates to the art of piercing blanks for seamless tubing; an it consists in a device for supporting and preventing free movement of the advancing end of the shell as it travels over and away from the piercingpoint and for preventing contact with the mandrel-ban heretofore in piercing or expanding long billets the-forward end of the shell has been unrestrained, so that it was free to drop down onto the supportingbar of the mandrel and to Whip violently around it, tending to distort the hollow billet and injure the bar, while preventing the manufacture of a perfeet blank. This objection is partly obviated by the sliding bushing shown in patent of William Dicks, No. 693,381, dated February 18, 1902; but I have found in practice that the weight of the advancing tube-in-process or hollow and the bushing, being borne entirely by the mandrel-bar upon which it is slidingly supported, tends to deflect the bar from true alinement, resulting in injury to the bar and an imperfect product. A

My invention is designed to overcome these objectionsand to provide a sliding support for the blank which will guide it uniformly in true alinement as it advances over the mandrel entirely independent of'the bar, while at the same time providing a supporting-bean ing for the bar, as shall be hereinafter described.

heferring'to the drawings, 2 3 are the disks of a piercing-mill of diiierent diameters, having the same'peripheralspeed, rotating in oppositedirections, as indicated, and vertically onset above andbelow each other,so as to; secure the forward leedof the billet due-to such arrangement, in the manner well understood and practiced in this art.

4 is the piercing-point or mandrel, located midway between the diherent horizontal cen-. ters, and suitably located with relation to the disks to penetrate the billet as it advances, the point being secured upon the end of the usual bar 5, positively held in position by a rigid bearing at the opposite end (not shown) and also by the sliding bearing 6 when adj acent to the point 4 at the commencement of the operation. The bearing 6 is slidingljamounted on supporting sliding bearings 7, being provided with suitable shoulders 8 or other ahLiLg devices to insure its proper direction of ti avel. lt is provided at its front portion with a recess or bearing-neck 9 for the bar 5, which may be merely a clearance-opening, but is preferably adapted to engage the bar and provide a hearing, so as to support the bar as it travels along underneath it. At its back portion'toward the advancing end of the I tube-in-process the bearing is provided with a semicircular flaring or tapered cavity 10, converging toward an annular shoulder 11, against which the end of the blank abuts. l'hewidth of the receiving-cavity 10 is somewhat greater than the diameter of the blank to insure its seating against the shoulder 11, p at which. point the upwardly-tapering bottom and inwardly-tapering sides converge to about the same 'mensions as the outer di' ameter of the blank, so as to insure its cen. tral engagement therewith. 1

At the commencement of the operation the bearing is setup close to the piercing-point, and 'as the blank emerges from between the disks over the point it enters the tapered opening of the bearing and abuts against the shoulder 11; As the blank continues to advance it pushes the bearing ahead of it along and upon the slides 7 to the limit of its travel, during which time the end of the blankis positively supported and retained and prevented from lateral movement or contact with the bar. During such operation the bearing also supports the bar by the neck 9 and positively prevents the injurious whipping referred to. If desired, the sides of the tapering opening and of the neck-bearing may be extended somewhat above the center of the bearing, insuring su'l'licient stock and giving good bearing-surfaces for the bar and blank. At the end of the rolling operation the bar and the finished hollow billet are removed, the shoulder 11 acting as a stop to hold the blank as the mandrel is withdrawn. The billet or shell is then disengaged and the mandrel and bar and sliding bearing are replaced ready for another operation. In cases where an alrcady-pierced billet is again passed over an expanding-plug the bearing is employed in the same manner as has been deScribed,With the same beneficial'results.

In Figs G and 7 I have shown a modified construction wherein the bearing 6 is provided with an opening 9 somewhat larger than the bar 5 and a backwardlyextending tapered nozzle 12, extending from the base 13, which provides an annular shoulder against which the hollow billet abuts. The diameter of the nozzle at its base is about the same or slightly less than the inner diameter of" the hollow billet, so that when once centered on it, as in Fig. 6, the billet will be maintained centrally throughout its travel and operation, entirely preventing contact with the bar.

The advantages of my'invention will be appreciated by those skilled in the art and will 'be found to provide a simple, ellicient, cheap, and durable device for the purposes in view. It may be changed or varied by the skilled mechanic; but all such changes are to be con sidered as within the scope of the following claims.

hat I claim is 1. In combination with the supportingbar for the plug or point of a piercing-mill, a

1 bearing slidingly mounted parallel with and underneath the bar, and provided with an I open top and a lowerportion adapted to engage and support the hollow billet. I

' '2. In combination with the supportingbar for the plug, or point of a piercing-mill, a

track parallel with'the bar and a bearing slidingly mounted thereon provided with an open top and a lower portion adapted to engage and support the hollow billet.

bar for the plug or point of a piercing-mill, a bearing slidingly mounted parallel with and underneath the bar and provided with an interior tapered bearing and a shoulder adapted to engage and support the hollow billet.

4. In combination with the supportingbar for the plug or point of a piercing-mill, a bearing slidingly mounted parallel with and underneath the bar and provided with an interior tapered bearing and a shoulder adapted to engage and support the hollow billet,

and a bearing for the bar.

5. A device for the purpose described consisting of a slidable bearing having an open top and a lower cohcave interior tapered wall, and a shoulder for the end of the hollow billet. 3

6. A device for thepurpose described con sisting of a slidable bearing having interior tapered walls, a shoulder for the end of the hollow billet and a neck-bearing for the mandrel-bar.

a piercing-mill, a plug or point, a bar thereing slidingly mounted upon the tracks and adapted to support the hollow billet.

In testimony whereof I al'lix my signature in presence of two witnesses.

GEORGE HENRY BLAXTER.

WVitnessesz- L. G. GRAY, S. E. MoKIBBEN.

i l l 3. In combmation with the supporting i 1 i i i 7. In combination with the disks or rolls of for, and guiding tracks parallel with the bar; an interiorly-tape'red open top concave bear-

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